| 摘要 |
PURPOSE:To make an error small, and in addition, to simplify circuit configuration by providing a third integrator to integrate the output of a second integrator and a D/A converter to control the frequency conversion characteristic of a receiver on the basis of this integrated result. CONSTITUTION:The receiver 2 converts the frequency of a received signal, and inputs it to a phase quantizer 3. The phase quantizer 3 quantizes the phase of the received signal by using a reference signal from a digital VCO 8, and outputs it to a terminal 4, and simultaneously, it inputs it to a frequency error detector 5. The detector 5 outputs lead/lag as one-bit information. A first integrator 6 integrates the lead/lag, and outputs an overflow signal and a sign as two-bit information. The second integrator 7 integrates the sign when the overflow signal is generated. The integrated result is inputted to the VCO 8 and the third integrator 9. The integrator 9 integrates the output of the integrator 7 when the integrator 7 operates integral operation. The integrator 9 outputs the integrated result to the D/A converter 10. The output of the converter 10 controls the frequency conversion characteristic of the receiver 2. |
